//
// Created by wze-zero on 2024/7/8 008.
//
#include <iostream>

using namespace std;

int main() {
    int score;
    cin >> score;
    if (score < 0 || score > 100) {
        cout << "成绩不合法" << endl;
    } else if (score >= 90) {
        cout << "优秀" << endl;
    } else if (score >= 80) {
        cout << "良" << endl;
    } else if (score >= 70) {
        cout << "中" << endl;
    } else if (score >= 60) {
        cout << "及格" << endl;
    } else {
        cout << "差" << endl;
    }
    return 0;
}